Implement a no sync rule (#7216)

* implement a no sync rule * fix linting disable * fix unused imports * exclude more testing * clean up fs usage * clean up more fs usage * remove duplicate of code * fix compile errors
2026-01-13 17:22:15 -05:00 · 2019-09-17 13:32:42 -07:00
parent 4d62983680
commit 28d453fced
31 changed files with 305 additions and 201 deletions
--- a/build/lib/tslint/noSyncRule.js
+++ b/build/lib/tslint/noSyncRule.js
@@ -0,0 +1,33 @@
+"use strict";
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+Object.defineProperty(exports, "__esModule", { value: true });
+const Lint = require("tslint");
+const minimatch = require("minimatch");
+class Rule extends Lint.Rules.AbstractRule {
+    apply(sourceFile) {
+        const args = this.getOptions().ruleArguments[0];
+        if (args.exclude.every(x => !minimatch(sourceFile.fileName, x))) {
+            return this.applyWithWalker(new NoSyncRuleWalker(sourceFile, this.getOptions()));
+        }
+        return [];
+    }
+}
+exports.Rule = Rule;
+class NoSyncRuleWalker extends Lint.RuleWalker {
+    constructor(file, opts) {
+        super(file, opts);
+    }
+    visitCallExpression(node) {
+        if (node.expression && NoSyncRuleWalker.operations.some(x => node.expression.getText().indexOf(x) >= 0)) {
+            this.addFailureAtNode(node, `Do not use Sync operations`);
+        }
+        super.visitCallExpression(node);
+    }
+}
+NoSyncRuleWalker.operations = ['readFileSync', 'writeFileSync', 'existsSync', 'fchmodSync', 'lchmodSync',
+    'statSync', 'fstatSync', 'lstatSync', 'linkSync', 'symlinkSync', 'readlinkSync', 'realpathSync', 'unlinkSync', 'rmdirSync',
+    'mkdirSync', 'mkdtempSync', 'readdirSync', 'openSync', 'utimesSync', 'futimesSync', 'fsyncSync', 'writeSync', 'readSync',
+    'appendFileSync', 'accessSync', 'fdatasyncSync', 'copyFileSync'];
--- a/build/lib/tslint/noSyncRule.ts
+++ b/build/lib/tslint/noSyncRule.ts
@@ -0,0 +1,45 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as ts from 'typescript';
+import * as Lint from 'tslint';
+import * as minimatch from 'minimatch';
+
+interface NoSyncRuleConfig {
+	exclude: string[];
+}
+
+export class Rule extends Lint.Rules.AbstractRule {
+
+	apply(sourceFile: ts.SourceFile): Lint.RuleFailure[] {
+		const args = <NoSyncRuleConfig>this.getOptions().ruleArguments[0];
+
+		if (args.exclude.every(x => !minimatch(sourceFile.fileName, x))) {
+			return this.applyWithWalker(new NoSyncRuleWalker(sourceFile, this.getOptions()));
+		}
+
+		return [];
+	}
+}
+
+class NoSyncRuleWalker extends Lint.RuleWalker {
+
+	private static readonly operations = ['readFileSync', 'writeFileSync', 'existsSync', 'fchmodSync', 'lchmodSync',
+	'statSync', 'fstatSync', 'lstatSync', 'linkSync', 'symlinkSync', 'readlinkSync', 'realpathSync', 'unlinkSync', 'rmdirSync',
+	'mkdirSync', 'mkdtempSync', 'readdirSync', 'openSync', 'utimesSync', 'futimesSync', 'fsyncSync', 'writeSync', 'readSync',
+	'appendFileSync', 'accessSync', 'fdatasyncSync', 'copyFileSync'];
+
+	constructor(file: ts.SourceFile, opts: Lint.IOptions) {
+		super(file, opts);
+	}
+
+	visitCallExpression(node: ts.CallExpression) {
+		if (node.expression && NoSyncRuleWalker.operations.some(x => node.expression.getText().indexOf(x) >= 0)) {
+			this.addFailureAtNode(node, `Do not use Sync operations`);
+		}
+
+		super.visitCallExpression(node);
+	}
+}
--- a/extensions/admin-tool-ext-win/src/main.ts
+++ b/extensions/admin-tool-ext-win/src/main.ts
@@ -10,8 +10,7 @@ import * as vscode from 'vscode';
 import { TelemetryReporter, TelemetryViews } from './telemetry';
 import { doubleEscapeSingleQuotes, backEscapeDoubleQuotes, getTelemetryErrorType } from './utils';
 import { ChildProcess, exec } from 'child_process';
-import { promisify } from 'util';
-import { readFile } from 'fs';
+import { promises as fs } from 'fs';

 const localize = nls.loadMessageBundle();

@@ -68,7 +67,7 @@ export interface LaunchSsmsDialogParams {
 export async function activate(context: vscode.ExtensionContext): Promise<void> {
 	// This is for Windows-specific support so do nothing on other platforms
 	if (process.platform === 'win32') {
-		const rawConfig = await promisify(readFile)(path.join(context.extensionPath, 'config.json'));
+		const rawConfig = await fs.readFile(path.join(context.extensionPath, 'config.json'));
 		const ssmsMinVer = JSON.parse(rawConfig.toString()).version;
 		exePath = path.join(context.extensionPath, 'ssmsmin', 'Windows', ssmsMinVer, 'ssmsmin.exe');
 		registerCommands(context);
--- a/extensions/agent/src/agentUtils.ts
+++ b/extensions/agent/src/agentUtils.ts
@@ -6,9 +6,7 @@
 'use strict';

 import * as azdata from 'azdata';
-import * as fs from 'fs';
-import { promisify } from 'util';
-
+import { promises as fs } from 'fs';

 export class AgentUtils {

@@ -52,18 +50,11 @@ export class AgentUtils {

 }

-export function exists(path: string): Promise<boolean> {
-	return promisify(fs.exists)(path);
-}
-
-export function mkdir(path: string): Promise<void> {
-	return promisify(fs.mkdir)(path);
-}
-
-export function unlink(path: string): Promise<void> {
-	return promisify(fs.unlink)(path);
-}
-
-export function writeFile(path: string, data: string): Promise<void> {
-	return promisify(fs.writeFile)(path, data);
+export async function exists(path: string): Promise<boolean> {
+	try {
+		await fs.access(path);
+		return true;
+	} catch (e) {
+		return false;
+	}
 }
--- a/extensions/agent/src/data/notebookData.ts
+++ b/extensions/agent/src/data/notebookData.ts
@@ -7,12 +7,10 @@
 import * as nls from 'vscode-nls';
 import * as azdata from 'azdata';
 import * as vscode from 'vscode';
-import * as fs from 'fs';
 import * as path from 'path';
-import { AgentUtils } from '../agentUtils';
+import { AgentUtils, exists } from '../agentUtils';
 import { IAgentDialogData, AgentDialogMode } from '../interfaces';
 import { NotebookDialogOptions } from '../dialogs/notebookDialog';
-import { createConnection } from 'net';

 const localize = nls.loadMessageBundle();
 const NotebookCompletionActionCondition_Always: string = localize('notebookData.whenJobCompletes', 'When the notebook completes');
@@ -179,7 +177,7 @@ export class NotebookData implements IAgentDialogData {
 		}
 	}

-	public validate(): { valid: boolean, errorMessages: string[] } {
+	public async validate(): Promise<{ valid: boolean, errorMessages: string[] }> {
 		let validationErrors: string[] = [];
 		if (this.dialogMode !== AgentDialogMode.EDIT) {
 			if (!(this.name && this.name.trim())) {
@@ -188,7 +186,7 @@ export class NotebookData implements IAgentDialogData {
 			if (!(this.templatePath && this.name.trim())) {
 				validationErrors.push(TemplatePathEmptyErrorMessage);
 			}
-			if (!fs.existsSync(this.templatePath)) {
+			if (!(await exists(this.templatePath))) {
 				validationErrors.push(InvalidNotebookPathErrorMessage);
 			}
 			if (NotebookData.jobLists) {
@@ -201,7 +199,7 @@ export class NotebookData implements IAgentDialogData {
 			}
 		}
 		else {
-			if (this.templatePath && this.templatePath !== '' && !fs.existsSync(this.templatePath)) {
+			if (this.templatePath && this.templatePath !== '' && !(await exists(this.templatePath))) {
 				validationErrors.push(InvalidNotebookPathErrorMessage);
 			}
 		}
--- a/extensions/agent/src/dialogs/notebookDialog.ts
+++ b/extensions/agent/src/dialogs/notebookDialog.ts
@@ -87,9 +87,9 @@ export class NotebookDialog extends AgentDialog<NotebookData>  {
 		this.generalTab = azdata.window.createTab(GeneralTabText);
 		this.initializeGeneralTab();
 		this.dialog.content = [this.generalTab];
-		this.dialog.registerCloseValidator(() => {
+		this.dialog.registerCloseValidator(async () => {
 			this.updateModel();
-			let validationResult = this.model.validate();
+			let validationResult = await this.model.validate();
 			if (!validationResult.valid) {
 				// TODO: Show Error Messages
 				this.dialog.message = { text: validationResult.errorMessages[0] };
--- a/extensions/agent/src/mainController.ts
+++ b/extensions/agent/src/mainController.ts
@@ -7,7 +7,7 @@
 import * as nls from 'vscode-nls';
 import * as azdata from 'azdata';
 import * as vscode from 'vscode';
-import * as fs from 'fs';
+import { promises as fs } from 'fs';
 import * as os from 'os';
 import * as path from 'path';
 import { AlertDialog } from './dialogs/alertDialog';
@@ -17,9 +17,8 @@ import { ProxyDialog } from './dialogs/proxyDialog';
 import { JobStepDialog } from './dialogs/jobStepDialog';
 import { PickScheduleDialog } from './dialogs/pickScheduleDialog';
 import { JobData } from './data/jobData';
-import { AgentUtils, exists, mkdir, unlink, writeFile } from './agentUtils';
+import { AgentUtils, exists } from './agentUtils';
 import { NotebookDialog, NotebookDialogOptions } from './dialogs/notebookDialog';
-import { promisify } from 'util';


 const localize = nls.loadMessageBundle();
@@ -102,7 +101,7 @@ export class MainController {
 			let templateMap = this.notebookTemplateMap.get(nbEditor.document.uri.toString());
 			let vsEditor = await vscode.workspace.openTextDocument(templateMap.fileUri);
 			let content = vsEditor.getText();
-			promisify(fs.writeFile)(templateMap.tempPath, content);
+			await fs.writeFile(templateMap.tempPath, content);
 			AgentUtils.getAgentService().then(async (agentService) => {
 				let result = await agentService.updateNotebook(templateMap.ownerUri, templateMap.notebookInfo.name, templateMap.notebookInfo, templateMap.tempPath);
 				if (result.success) {
@@ -128,14 +127,13 @@ export class MainController {
 		vscode.commands.registerCommand('agent.openNotebookEditorFromJsonString', async (filename: string, jsonNotebook: string, notebookInfo?: azdata.AgentNotebookInfo, ownerUri?: string) => {
 			const tempfilePath = path.join(os.tmpdir(), 'mssql_notebooks', filename + '.ipynb');
 			if (!await exists(path.join(os.tmpdir(), 'mssql_notebooks'))) {
-				await mkdir(path.join(os.tmpdir(), 'mssql_notebooks'));
+				await fs.mkdir(path.join(os.tmpdir(), 'mssql_notebooks'));
 			}
-			let editors = azdata.nb.visibleNotebookEditors;
 			if (await exists(tempfilePath)) {
-				await unlink(tempfilePath);
+				await fs.unlink(tempfilePath);
 			}
 			try {
-				await writeFile(tempfilePath, jsonNotebook);
+				await fs.writeFile(tempfilePath, jsonNotebook);
 				let uri = vscode.Uri.parse(`untitled:${path.basename(tempfilePath)}`);
 				if (notebookInfo) {
 					this.notebookTemplateMap.set(uri.toString(), { notebookInfo: notebookInfo, fileUri: uri, ownerUri: ownerUri, tempPath: tempfilePath });
--- a/extensions/azurecore/src/account-provider/tokenCache.ts
+++ b/extensions/azurecore/src/account-provider/tokenCache.ts
@@ -6,7 +6,7 @@
 import * as adal from 'adal-node';
 import * as azdata from 'azdata';
 import * as crypto from 'crypto';
-import * as fs from 'fs';
+import { promises as fs } from 'fs';

 export default class TokenCache implements adal.TokenCache {
 	private static CipherAlgorithm = 'aes-256-cbc';
@@ -58,23 +58,19 @@ export default class TokenCache implements adal.TokenCache {
 		});
 	}

-	public clear(): Thenable<void> {
-		let self = this;
+	public async clear(): Promise<void> {

 		// 1) Delete encrypted serialization file
 		//    If we got an 'ENOENT' response, the file doesn't exist, which is fine
 		// 3) Delete the encryption key
-		return new Promise<void>((resolve, reject) => {
-			fs.unlink(self._cacheSerializationPath, err => {
-				if (err && err.code !== 'ENOENT') {
-					reject(err);
-				} else {
-					resolve();
-				}
-			});
-		})
-			.then(() => { return self._credentialProvider.deleteCredential(self._credentialServiceKey); })
-			.then(() => { });
+		try {
+			await fs.unlink(this._cacheSerializationPath);
+		} catch (err) {
+			if (err.code !== 'ENOENT') {
+				throw err;
+			}
+		}
+		await this._credentialProvider.deleteCredential(this._credentialServiceKey);
 	}

 	public find(query: any, callback: (error: Error, results: any[]) => void): void {
@@ -230,7 +226,7 @@ export default class TokenCache implements adal.TokenCache {
 			});
 	}

-	private readCache(): Thenable<adal.TokenResponse[]> {
+	private async readCache(): Promise<adal.TokenResponse[]> {
 		let self = this;

 		// NOTE: File system operations are performed synchronously to avoid annoying nested callbacks
@@ -239,13 +235,13 @@ export default class TokenCache implements adal.TokenCache {
 		// 3) Decrypt the file contents
 		// 4) Deserialize and return
 		return this.getOrCreateEncryptionParams()
-			.then(encryptionParams => {
+			.then(async encryptionParams => {
 				try {
 					return self.decryptCache('utf8', encryptionParams);
 				} catch (e) {
 					try {
 						// try to parse using 'binary' encoding and rewrite cache as UTF8
-						let response = self.decryptCache('binary', encryptionParams);
+						let response = await self.decryptCache('binary', encryptionParams);
 						self.writeCache(response);
 						return response;
 					} catch (e) {
@@ -260,17 +256,17 @@ export default class TokenCache implements adal.TokenCache {
 			});
 	}

-	private decryptCache(encoding: crypto.Utf8AsciiBinaryEncoding, encryptionParams: EncryptionParams): adal.TokenResponse[] {
-		let cacheCipher = fs.readFileSync(this._cacheSerializationPath, TokenCache.FsOptions);
+	private async decryptCache(encoding: crypto.Utf8AsciiBinaryEncoding, encryptionParams: EncryptionParams): Promise<adal.TokenResponse[]> {
+		let cacheCipher = await fs.readFile(this._cacheSerializationPath, TokenCache.FsOptions);
 		let decipher = crypto.createDecipheriv(TokenCache.CipherAlgorithm, encryptionParams.key, encryptionParams.initializationVector);
-		let cacheJson = decipher.update(cacheCipher, 'hex', encoding);
+		let cacheJson = decipher.update(cacheCipher.toString(), 'hex', encoding);
 		cacheJson += decipher.final(encoding);

 		// Deserialize the JSON into the array of tokens
 		let cacheObj = <adal.TokenResponse[]>JSON.parse(cacheJson);
-		for (let objIndex in cacheObj) {
+		for (const obj of cacheObj) {
 			// Rehydrate Date objects since they will always serialize as a string
-			cacheObj[objIndex].expiresOn = new Date(<string>cacheObj[objIndex].expiresOn);
+			obj.expiresOn = new Date(<string>obj.expiresOn);
 		}

 		return cacheObj;
@@ -297,7 +293,7 @@ export default class TokenCache implements adal.TokenCache {
 		// 4) Encrypt the JSON
 		// 3) Write to the file
 		return this.getOrCreateEncryptionParams()
-			.then(encryptionParams => {
+			.then(async encryptionParams => {
 				try {
 					let cacheJson = JSON.stringify(cache);

@@ -305,7 +301,7 @@ export default class TokenCache implements adal.TokenCache {
 					let cacheCipher = cipher.update(cacheJson, 'utf8', 'hex');
 					cacheCipher += cipher.final('hex');

-					fs.writeFileSync(self._cacheSerializationPath, cacheCipher, TokenCache.FsOptions);
+					await fs.writeFile(self._cacheSerializationPath, cacheCipher, TokenCache.FsOptions);
 				} catch (e) {
 					throw e;
 				}
--- a/extensions/azurecore/src/extension.ts
+++ b/extensions/azurecore/src/extension.ts
@@ -4,7 +4,7 @@
 *--------------------------------------------------------------------------------------------*/

 import * as vscode from 'vscode';
-import * as fs from 'fs';
+import { promises as fs } from 'fs';
 import * as path from 'path';
 import * as os from 'os';
 import * as constants from './constants';
@@ -54,12 +54,12 @@ function pushDisposable(disposable: vscode.Disposable): void {

 // this method is called when your extension is activated
 // your extension is activated the very first time the command is executed
-export function activate(context: vscode.ExtensionContext) {
+export async function activate(context: vscode.ExtensionContext) {
 	extensionContext = context;
 	const apiWrapper = new ApiWrapper();
 	let appContext = new AppContext(extensionContext, apiWrapper);

-	let storagePath = findOrMakeStoragePath();
+	let storagePath = await findOrMakeStoragePath();
 	if (!storagePath) {
 		return undefined;
 	}
@@ -82,12 +82,21 @@ export function activate(context: vscode.ExtensionContext) {
 	};
 }

+async function exists(path: string): Promise<boolean> {
+	try {
+		await fs.access(path);
+		return true;
+	} catch (e) {
+		return false;
+	}
+}
+
 // Create the folder for storing the token caches
-function findOrMakeStoragePath() {
+async function findOrMakeStoragePath() {
 	let storagePath = path.join(getDefaultLogLocation(), constants.extensionName);
 	try {
-		if (!fs.existsSync(storagePath)) {
-			fs.mkdirSync(storagePath);
+		if (!(await exists(storagePath))) {
+			await fs.mkdir(storagePath);
 			console.log('Initialized Azure account extension storage.');
 		}
 	}
@@ -124,4 +133,3 @@ function registerCommands(appContext: AppContext, azureResourceTree: AzureResour

 	registerAzureResourceDatabaseCommands(appContext);
 }
-
--- a/extensions/import/src/services/serviceClient.ts
+++ b/extensions/import/src/services/serviceClient.ts
@@ -6,7 +6,7 @@
 'use strict';

 import { SqlOpsDataClient, ClientOptions } from 'dataprotocol-client';
-import { IConfig, ServerProvider, Events } from 'service-downloader';
+import { ServerProvider, Events } from 'service-downloader';
 import { ServerOptions, TransportKind } from 'vscode-languageclient';
 import * as vscode from 'vscode';
 import * as nls from 'vscode-nls';
@@ -18,8 +18,7 @@ import { Telemetry, LanguageClientErrorHandler } from './telemetry';
 import * as Constants from '../constants';
 import { TelemetryFeature, FlatFileImportFeature } from './features';
 import * as serviceUtils from './serviceUtils';
-import { promisify } from 'util';
-import { readFile } from 'fs';
+import { promises as fs } from 'fs';

 export class ServiceClient {
 	private statusView: vscode.StatusBarItem;
@@ -29,7 +28,7 @@ export class ServiceClient {
 	}

 	public async startService(context: vscode.ExtensionContext): Promise<SqlOpsDataClient> {
-		const rawConfig = await promisify(readFile)(path.join(context.extensionPath, 'config.json'));
+		const rawConfig = await fs.readFile(path.join(context.extensionPath, 'config.json'));
 		const config = JSON.parse(rawConfig.toString());
 		config.installDirectory = path.join(context.extensionPath, config.installDirectory);
 		config.proxy = vscode.workspace.getConfiguration('http').get('proxy');
--- a/extensions/mssql/src/main.ts
+++ b/extensions/mssql/src/main.ts
@@ -28,6 +28,7 @@ import { registerBooksWidget } from './dashboard/bookWidget';
 import { createMssqlApi } from './mssqlApiFactory';
 import { localize } from './localize';
 import { SqlToolsServer } from './sqlToolsServer';
+import { promises as fs } from 'fs';

 const msgSampleCodeDataFrame = localize('msgSampleCodeDataFrame', 'This sample code loads the file into a data frame and shows the first 10 results.');

@@ -42,8 +43,8 @@ export async function activate(context: vscode.ExtensionContext): Promise<IExten
 	}

 	// ensure our log path exists
-	if (!(await Utils.pfs.exists(context.logPath))) {
-		await Utils.pfs.mkdir(context.logPath);
+	if (!(await Utils.exists(context.logPath))) {
+		await fs.mkdir(context.logPath);
 	}

 	let prompter: IPrompter = new CodeAdapter();
@@ -200,7 +201,7 @@ async function handleOpenNotebookTask(profile: azdata.IConnectionProfile): Promi
 async function handleOpenClusterStatusNotebookTask(profile: azdata.IConnectionProfile, appContext: AppContext): Promise<void> {
 	const notebookRelativePath: string = 'notebooks/tsg/cluster-status.ipynb';
 	const notebookFullPath: string = path.join(appContext.extensionContext.extensionPath, notebookRelativePath);
-	if (!Utils.fileExists(notebookFullPath)) {
+	if (!(await Utils.exists(notebookFullPath))) {
 		vscode.window.showErrorMessage(localize("fileNotFound", "Unable to find the file specified"));
 	} else {
 		const title: string = Utils.findNextUntitledEditorName(notebookFullPath);
--- a/extensions/mssql/src/objectExplorerNodeProvider/hdfsCommands.ts
+++ b/extensions/mssql/src/objectExplorerNodeProvider/hdfsCommands.ts
@@ -5,7 +5,7 @@

 import * as vscode from 'vscode';
 import * as azdata from 'azdata';
-import * as fs from 'fs';
+import { promises as fs } from 'fs';
 import * as fspath from 'path';
 import * as nls from 'vscode-nls';
 const localize = nls.loadMessageBundle();
@@ -22,7 +22,7 @@ import { AppContext } from '../appContext';
 import { TreeNode } from './treeNodes';
 import { MssqlObjectExplorerNodeProvider } from './objectExplorerNodeProvider';

-function getSaveableUri(apiWrapper: ApiWrapper, fileName: string, isPreview?: boolean): vscode.Uri {
+async function getSaveableUri(apiWrapper: ApiWrapper, fileName: string, isPreview?: boolean): Promise<vscode.Uri> {
 	let root = utils.getUserHome();
 	let workspaceFolders = apiWrapper.workspaceFolders;
 	if (workspaceFolders && workspaceFolders.length > 0) {
@@ -33,7 +33,7 @@ function getSaveableUri(apiWrapper: ApiWrapper, fileName: string, isPreview?: bo
 		let fileNum = 1;
 		let fileNameWithoutExtension = fspath.parse(fileName).name;
 		let fileExtension = fspath.parse(fileName).ext;
-		while (fs.existsSync(fspath.join(root, fileName))) {
+		while (await utils.exists(fspath.join(root, fileName))) {
 			fileName = `${fileNameWithoutExtension}-${fileNum}${fileExtension}`;
 			fileNum++;
 		}
@@ -82,7 +82,7 @@ export class UploadFilesCommand extends ProgressCommand {
 				};
 				let fileUris: vscode.Uri[] = await this.apiWrapper.showOpenDialog(options);
 				if (fileUris) {
-					let files: IFile[] = fileUris.map(uri => uri.fsPath).map(this.mapPathsToFiles());
+					let files: IFile[] = await Promise.all(fileUris.map(uri => uri.fsPath).map(this.mapPathsToFiles()));
 					await this.executeWithProgress(
 						(cancelToken: vscode.CancellationTokenSource) => this.writeFiles(files, folderNode, cancelToken),
 						localize('uploading', 'Uploading files to HDFS'), true,
@@ -99,9 +99,9 @@ export class UploadFilesCommand extends ProgressCommand {
 		}
 	}

-	private mapPathsToFiles(): (value: string, index: number, array: string[]) => File {
-		return (path: string) => {
-			let isDir = fs.lstatSync(path).isDirectory();
+	private mapPathsToFiles(): (value: string, index: number, array: string[]) => Promise<File> {
+		return async (path: string) => {
+			let isDir = (await fs.lstat(path)).isDirectory();
 			return new File(path, isDir);
 		};
 	}
@@ -115,9 +115,9 @@ export class UploadFilesCommand extends ProgressCommand {
 			if (file.isDirectory) {
 				let dirName = fspath.basename(file.path);
 				let subFolder = await folderNode.mkdir(dirName);
-				let children: IFile[] = fs.readdirSync(file.path)
+				let children: IFile[] = await Promise.all((await fs.readdir(file.path))
 					.map(childFileName => joinHdfsPath(file.path, childFileName))
-					.map(this.mapPathsToFiles());
+					.map(this.mapPathsToFiles()));
 				this.writeFiles(children, subFolder, cancelToken);
 			} else {
 				await folderNode.writeFile(file);
@@ -258,7 +258,7 @@ export class SaveFileCommand extends ProgressCommand {
 		try {
 			let fileNode = await getNode<FileNode>(context, this.appContext);
 			if (fileNode) {
-				let defaultUri = getSaveableUri(this.apiWrapper, fspath.basename(fileNode.hdfsPath));
+				let defaultUri = await getSaveableUri(this.apiWrapper, fspath.basename(fileNode.hdfsPath));
 				let fileUri: vscode.Uri = await this.apiWrapper.showSaveDialog({
 					defaultUri: defaultUri
 				});
@@ -330,7 +330,7 @@ export class PreviewFileCommand extends ProgressCommand {
 	private async showNotebookDocument(fileName: string, connectionProfile?: azdata.IConnectionProfile,
 		initialContent?: string
 	): Promise<azdata.nb.NotebookEditor> {
-		let docUri: vscode.Uri = getSaveableUri(this.apiWrapper, fileName, true)
+		let docUri: vscode.Uri = (await getSaveableUri(this.apiWrapper, fileName, true))
 			.with({ scheme: constants.UNTITLED_SCHEMA });
 		return await azdata.nb.showNotebookDocument(docUri, {
 			connectionProfile: connectionProfile,
@@ -340,7 +340,7 @@ export class PreviewFileCommand extends ProgressCommand {
 	}

 	private async openTextDocument(fileName: string): Promise<vscode.TextDocument> {
-		let docUri: vscode.Uri = getSaveableUri(this.apiWrapper, fileName, true);
+		let docUri: vscode.Uri = await getSaveableUri(this.apiWrapper, fileName, true);
 		if (docUri) {
 			docUri = docUri.with({ scheme: constants.UNTITLED_SCHEMA });
 			return await this.apiWrapper.openTextDocument(docUri);
--- a/extensions/mssql/src/sparkFeature/dialog/sparkJobSubmission/sparkConfigurationTab.ts
+++ b/extensions/mssql/src/sparkFeature/dialog/sparkJobSubmission/sparkConfigurationTab.ts
@@ -8,7 +8,6 @@
 import * as azdata from 'azdata';
 import * as nls from 'vscode-nls';
 import * as fspath from 'path';
-import * as fs from 'fs';
 import * as vscode from 'vscode';
 import * as utils from '../../../utils';
 import * as LocalizedConstants from '../../../localizedConstants';
@@ -223,7 +222,7 @@ export class SparkConfigurationTab {

 		// 1. For local file Source check whether they existed.
 		if (this._dataModel.isMainSourceFromLocal) {
-			if (!fs.existsSync(this._dataModel.localFileSourcePath)) {
+			if (!(await utils.exists(this._dataModel.localFileSourcePath))) {
 				this._dataModel.showDialogError(LocalizedConstants.sparkJobSubmissionLocalFileNotExisted(this._dataModel.localFileSourcePath));
 				return false;
 			}
--- a/extensions/mssql/src/sparkFeature/dialog/sparkJobSubmission/sparkJobSubmissionModel.ts
+++ b/extensions/mssql/src/sparkFeature/dialog/sparkJobSubmission/sparkJobSubmissionModel.ts
@@ -8,7 +8,6 @@
 import * as azdata from 'azdata';
 import * as nls from 'vscode-nls';
 const localize = nls.loadMessageBundle();
-import * as fs from 'fs';
 import * as fspath from 'path';
 import * as os from 'os';

@@ -143,7 +142,7 @@ export class SparkJobSubmissionModel {
 				return Promise.reject(localize('sparkJobSubmission_localFileOrFolderNotSpecified.', 'Property localFilePath or hdfsFolderPath is not specified. '));
 			}

-			if (!fs.existsSync(localFilePath)) {
+			if (!(await utils.exists(localFilePath))) {
 				return Promise.reject(LocalizedConstants.sparkJobSubmissionLocalFileNotExisted(localFilePath));
 			}

--- a/extensions/mssql/src/sparkFeature/sparkUtils.ts
+++ b/extensions/mssql/src/sparkFeature/sparkUtils.ts
@@ -45,12 +45,12 @@ export function getTemplatePath(extensionPath: string, templateName: string): st
 }
 export function shellWhichResolving(cmd: string): Promise<string> {
 	return new Promise<string>(resolve => {
-		which(cmd, (err, foundPath) => {
+		which(cmd, async (err, foundPath) => {
 			if (err) {
 				resolve(undefined);
 			} else {
 				// NOTE: Using realpath b/c some system installs are symlinked from */bin
-				resolve(fs.realpathSync(foundPath));
+				resolve(await fs.promises.realpath(foundPath));
 			}
 		});
 	});
--- a/extensions/mssql/src/sqlToolsServer.ts
+++ b/extensions/mssql/src/sqlToolsServer.ts
@@ -20,8 +20,7 @@ import { AppContext } from './appContext';
 import { DacFxService } from './dacfx/dacFxService';
 import { CmsService } from './cms/cmsService';
 import { CompletionExtensionParams, CompletionExtLoadRequest } from './contracts';
-import { promisify } from 'util';
-import { readFile } from 'fs';
+import { promises as fs } from 'fs';

 const outputChannel = vscode.window.createOutputChannel(Constants.serviceName);
 const statusView = vscode.window.createStatusBarItem(vscode.StatusBarAlignment.Left);
@@ -70,7 +69,7 @@ export class SqlToolsServer {
 	}

 	private async download(context: AppContext): Promise<string> {
-		const rawConfig = await promisify(readFile)(path.join(context.extensionContext.extensionPath, 'config.json'));
+		const rawConfig = await fs.readFile(path.join(context.extensionContext.extensionPath, 'config.json'));
 		this.config = JSON.parse(rawConfig.toString());
 		this.config.installDirectory = path.join(__dirname, this.config.installDirectory);
 		this.config.proxy = vscode.workspace.getConfiguration('http').get('proxy');
--- a/extensions/mssql/src/utils.ts
+++ b/extensions/mssql/src/utils.ts
@@ -10,8 +10,7 @@ import * as crypto from 'crypto';
 import * as os from 'os';
 import * as findRemoveSync from 'find-remove';
 import * as constants from './constants';
-import * as fs from 'fs';
-import { promisify } from 'util';
+import { promises as fs } from 'fs';

 const configTracingLevel = 'tracingLevel';
 const configLogRetentionMinutes = 'logRetentionMinutes';
@@ -31,17 +30,6 @@ export function getAppDataPath() {
 	}
 }

-export namespace pfs {
-
-	export function exists(path: string): Promise<boolean> {
-		return promisify(fs.exists)(path);
-	}
-
-	export function mkdir(path: string, mode?: number): Promise<void> {
-		return promisify(fs.mkdir)(path, mode);
-	}
-}
-
 /**
 * Get a file name that is not already used in the target directory
 * @param filePath source notebook file name
@@ -61,14 +49,6 @@ export function findNextUntitledEditorName(filePath: string): string {
 	return title;
 }

-export function fileExists(file: string): boolean {
-	return fs.existsSync(file);
-}
-
-export function copyFile(source: string, target: string): void {
-	fs.copyFileSync(source, target);
-}
-
 export function removeOldLogFiles(logPath: string, prefix: string): JSON {
 	return findRemoveSync(logPath, { age: { seconds: getConfigLogRetentionSeconds() }, limit: getConfigLogFilesRemovalLimit() });
 }
@@ -303,3 +283,12 @@ export function logDebug(msg: any): void {
 		console.log(outputMsg);
 	}
 }
+
+export async function exists(path: string): Promise<boolean> {
+	try {
+		await fs.access(path);
+		return true;
+	} catch (e) {
+		return false;
+	}
+}
--- a/extensions/notebook/src/book/bookTreeItem.ts
+++ b/extensions/notebook/src/book/bookTreeItem.ts
@@ -78,6 +78,7 @@ export class BookTreeItem extends vscode.TreeItem {
 			if (this.book.tableOfContents.sections[i].url) {
 				// TODO: Currently only navigating to notebooks. Need to add logic for markdown.
 				let pathToNotebook = path.join(this.book.root, 'content', this.book.tableOfContents.sections[i].url.concat('.ipynb'));
+				// tslint:disable-next-line:no-sync
 				if (fs.existsSync(pathToNotebook)) {
 					this._previousUri = pathToNotebook;
 					return;
@@ -93,6 +94,7 @@ export class BookTreeItem extends vscode.TreeItem {
 			if (this.book.tableOfContents.sections[i].url) {
 				// TODO: Currently only navigating to notebooks. Need to add logic for markdown.
 				let pathToNotebook = path.join(this.book.root, 'content', this.book.tableOfContents.sections[i].url.concat('.ipynb'));
+				// tslint:disable-next-line:no-sync
 				if (fs.existsSync(pathToNotebook)) {
 					this._nextUri = pathToNotebook;
 					return;
--- a/extensions/notebook/src/book/bookTreeView.ts
+++ b/extensions/notebook/src/book/bookTreeView.ts
@@ -6,18 +6,16 @@
 import * as azdata from 'azdata';
 import * as vscode from 'vscode';
 import * as path from 'path';
-import * as fs from 'fs';
+import { promises as fs } from 'fs';
 import * as yaml from 'js-yaml';
 import * as glob from 'fast-glob';
 import { BookTreeItem, BookTreeItemType } from './bookTreeItem';
 import { maxBookSearchDepth, notebookConfigKey } from '../common/constants';
-import { isEditorTitleFree } from '../common/utils';
+import { isEditorTitleFree, exists } from '../common/utils';
 import * as nls from 'vscode-nls';
-import { promisify } from 'util';
 import { IJupyterBookToc, IJupyterBookSection } from '../contracts/content';

 const localize = nls.loadMessageBundle();
-const existsAsync = promisify(fs.exists);

 export class BookTreeViewProvider implements vscode.TreeDataProvider<BookTreeItem>, azdata.nb.NavigationProvider {
 	readonly providerId: string = 'BookNavigator';
@@ -84,7 +82,7 @@ export class BookTreeViewProvider implements vscode.TreeDataProvider<BookTreeIte
 				const bookViewer = vscode.window.createTreeView('bookTreeView', { showCollapseAll: true, treeDataProvider: this });
 				await vscode.commands.executeCommand('workbench.books.action.focusBooksExplorer');
 				this._openAsUntitled = openAsUntitled;
-				let books = this.getBooks();
+				let books = await this.getBooks();
 				if (books && books.length > 0) {
 					const rootTreeItem = books[0];
 					const sectionToOpen = rootTreeItem.findChildSection(urlToOpen);
@@ -92,8 +90,8 @@ export class BookTreeViewProvider implements vscode.TreeDataProvider<BookTreeIte
 					const urlPath = sectionToOpen ? sectionToOpen.url : rootTreeItem.tableOfContents.sections[0].url;
 					const sectionToOpenMarkdown: string = path.join(bookPath, 'content', urlPath.concat('.md'));
 					const sectionToOpenNotebook: string = path.join(bookPath, 'content', urlPath.concat('.ipynb'));
-					const markdownExists = await existsAsync(sectionToOpenMarkdown);
-					const notebookExists = await existsAsync(sectionToOpenNotebook);
+					const markdownExists = await exists(sectionToOpenMarkdown);
+					const notebookExists = await exists(sectionToOpenNotebook);
 					if (markdownExists) {
 						vscode.commands.executeCommand('markdown.showPreview', vscode.Uri.file(sectionToOpenMarkdown));
 					}
@@ -208,13 +206,13 @@ export class BookTreeViewProvider implements vscode.TreeDataProvider<BookTreeIte
 		return array.reduce((acc, val) => Array.isArray(val.sections) ? acc.concat(val).concat(this.parseJupyterSection(val.sections)) : acc.concat(val), []);
 	}

-	public getBooks(): BookTreeItem[] {
+	public async getBooks(): Promise<BookTreeItem[]> {
 		let books: BookTreeItem[] = [];
-		for (let i in this._tableOfContentPaths) {
-			let root = path.dirname(path.dirname(this._tableOfContentPaths[i]));
+		for (const contentPath of this._tableOfContentPaths) {
+			let root = path.dirname(path.dirname(contentPath));
 			try {
-				const config = yaml.safeLoad(fs.readFileSync(path.join(root, '_config.yml'), 'utf-8'));
-				const tableOfContents = yaml.safeLoad(fs.readFileSync(this._tableOfContentPaths[i], 'utf-8'));
+				const config = yaml.safeLoad((await fs.readFile(path.join(root, '_config.yml'), 'utf-8')).toString());
+				const tableOfContents = yaml.safeLoad((await fs.readFile(contentPath, 'utf-8')).toString());
 				try {
 					let book = new BookTreeItem({
 						title: config.title,
@@ -242,7 +240,7 @@ export class BookTreeViewProvider implements vscode.TreeDataProvider<BookTreeIte
 		return books;
 	}

-	public getSections(tableOfContents: IJupyterBookToc, sections: IJupyterBookSection[], root: string): BookTreeItem[] {
+	public async getSections(tableOfContents: IJupyterBookToc, sections: IJupyterBookSection[], root: string): Promise<BookTreeItem[]> {
 		let notebooks: BookTreeItem[] = [];
 		for (let i = 0; i < sections.length; i++) {
 			if (sections[i].url) {
@@ -267,7 +265,7 @@ export class BookTreeViewProvider implements vscode.TreeDataProvider<BookTreeIte
 					let pathToMarkdown = path.join(root, 'content', sections[i].url.concat('.md'));
 					// Note: Currently, if there is an ipynb and a md file with the same name, Jupyter Books only shows the notebook.
 					// Following Jupyter Books behavior for now
-					if (fs.existsSync(pathToNotebook)) {
+					if (await exists(pathToNotebook)) {
 						let notebook = new BookTreeItem({
 							title: sections[i].title,
 							root: root,
@@ -286,7 +284,7 @@ export class BookTreeViewProvider implements vscode.TreeDataProvider<BookTreeIte
 						if (this._openAsUntitled) {
 							this._allNotebooks.set(path.basename(pathToNotebook), notebook);
 						}
-					} else if (fs.existsSync(pathToMarkdown)) {
+					} else if (await exists(pathToMarkdown)) {
 						let markdown = new BookTreeItem({
 							title: sections[i].title,
 							root: root,
--- a/extensions/notebook/src/common/utils.ts
+++ b/extensions/notebook/src/common/utils.ts
@@ -188,3 +188,12 @@ export function getHostAndPortFromEndpoint(endpoint: string): HostAndIp {
 		port: undefined
 	};
 }
+
+export async function exists(path: string): Promise<boolean> {
+	try {
+		await fs.access(path);
+		return true;
+	} catch (e) {
+		return false;
+	}
+}
--- a/extensions/notebook/src/dialog/configurePythonDialog.ts
+++ b/extensions/notebook/src/dialog/configurePythonDialog.ts
@@ -6,7 +6,7 @@
 import * as vscode from 'vscode';
 import * as nls from 'vscode-nls';
 import * as azdata from 'azdata';
-import * as fs from 'fs';
+import { promises as fs } from 'fs';
 import * as utils from '../common/utils';

 import { JupyterServerInstallation } from '../jupyter/jupyterServerInstallation';
@@ -220,7 +220,7 @@ export class ConfigurePythonDialog {

 			if (useExistingPython) {
 				let exePath = JupyterServerInstallation.getPythonExePath(pythonLocation, true);
-				let pythonExists = fs.existsSync(exePath);
+				let pythonExists = await utils.exists(exePath);
 				if (!pythonExists) {
 					this.showErrorMessage(this.PythonNotFoundMsg);
 					return false;
@@ -243,27 +243,23 @@ export class ConfigurePythonDialog {
 		return true;
 	}

-	private isFileValid(pythonLocation: string): Promise<boolean> {
+	private async isFileValid(pythonLocation: string): Promise<boolean> {
 		let self = this;
-		return new Promise<boolean>(function (resolve) {
-			fs.stat(pythonLocation, function (err, stats) {
-				if (err) {
-					// Ignore error if folder doesn't exist, since it will be
-					// created during installation
-					if (err.code !== 'ENOENT') {
-						self.showErrorMessage(err.message);
-						resolve(false);
-					}
-				}
-				else {
-					if (stats.isFile()) {
-						self.showErrorMessage(self.InvalidLocationMsg);
-						resolve(false);
-					}
-				}
-				resolve(true);
-			});
-		});
+		try {
+			const stats = await fs.stat(pythonLocation);
+			if (stats.isFile()) {
+				self.showErrorMessage(self.InvalidLocationMsg);
+				return false;
+			}
+		} catch (err) {
+			// Ignore error if folder doesn't exist, since it will be
+			// created during installation
+			if (err.code !== 'ENOENT') {
+				self.showErrorMessage(err.message);
+				return false;
+			}
+		}
+		return true;
 	}

 	private async handleBrowse(): Promise<void> {
@@ -304,4 +300,4 @@ export class ConfigurePythonDialog {
 			level: azdata.window.MessageLevel.Error
 		};
 	}
-}
+}
--- a/extensions/notebook/src/dialog/pythonPathLookup.ts
+++ b/extensions/notebook/src/dialog/pythonPathLookup.ts
@@ -3,7 +3,6 @@
 *  Licensed under the Source EULA. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

-import * as fs from 'fs';
 import * as glob from 'glob';

 import * as utils from '../common/utils';
@@ -92,7 +91,7 @@ export class PythonPathLookup {
 			const cmd = `"${options.command}" ${args.join(' ')}`;
 			let output = await utils.executeBufferedCommand(cmd, {});
 			let value = output ? output.trim() : '';
-			if (value.length > 0 && fs.existsSync(value)) {
+			if (value.length > 0 && await utils.exists(value)) {
 				return value;
 			}
 		} catch (err) {
@@ -163,4 +162,4 @@ export class PythonPathLookup {
 		}
 		return undefined;
 	}
-}
+}
--- a/extensions/notebook/src/jupyter/jupyterServerInstallation.ts
+++ b/extensions/notebook/src/jupyter/jupyterServerInstallation.ts
@@ -67,7 +67,7 @@ export class JupyterServerInstallation {
 	}

 	private async installDependencies(backgroundOperation: azdata.BackgroundOperation): Promise<void> {
-		if (!fs.existsSync(this._pythonExecutable) || this._forceInstall || this._usingExistingPython) {
+		if (!(await utils.exists(this._pythonExecutable)) || this._forceInstall || this._usingExistingPython) {
 			window.showInformationMessage(msgInstallPkgStart);

 			this.outputChannel.show(true);
@@ -180,11 +180,11 @@ export class JupyterServerInstallation {
 					});

 				downloadRequest.pipe(fs.createWriteStream(pythonPackagePathLocal))
-					.on('close', () => {
+					.on('close', async () => {
 						//unpack python zip/tar file
 						this.outputChannel.appendLine(msgPythonUnpackPending);
 						let pythonSourcePath = path.join(installPath, constants.pythonBundleVersion);
-						if (!this._usingExistingPython && fs.existsSync(pythonSourcePath)) {
+						if (!this._usingExistingPython && await utils.exists(pythonSourcePath)) {
 							try {
 								fs.removeSync(pythonSourcePath);
 							} catch (err) {
@@ -256,7 +256,7 @@ export class JupyterServerInstallation {
 			}
 		}

-		if (fs.existsSync(this._pythonExecutable)) {
+		if (await utils.exists(this._pythonExecutable)) {
 			let pythonUserDir = await this.getPythonUserDir(this._pythonExecutable);
 			if (pythonUserDir) {
 				this.pythonEnvVarPath = pythonUserDir + delimiter + this.pythonEnvVarPath;
@@ -330,7 +330,7 @@ export class JupyterServerInstallation {
 			await this.configurePackagePaths();
 		};
 		let installReady = new Deferred<void>();
-		if (!fs.existsSync(this._pythonExecutable) || this._forceInstall || this._usingExistingPython) {
+		if (!(await utils.exists(this._pythonExecutable)) || this._forceInstall || this._usingExistingPython) {
 			this.apiWrapper.startBackgroundOperation({
 				displayName: msgTaskName,
 				description: msgTaskName,
@@ -522,6 +522,7 @@ export class JupyterServerInstallation {
 		}

 		let condaExePath = this.getCondaExePath();
+		// tslint:disable-next-line:no-sync
 		return fs.existsSync(condaExePath);
 	}

@@ -538,6 +539,7 @@ export class JupyterServerInstallation {

 		let useExistingInstall = JupyterServerInstallation.getExistingPythonSetting(apiWrapper);
 		let pythonExe = JupyterServerInstallation.getPythonExePath(pathSetting, useExistingInstall);
+		// tslint:disable-next-line:no-sync
 		return fs.existsSync(pythonExe);
 	}

@@ -568,6 +570,7 @@ export class JupyterServerInstallation {
 			let notebookConfig = apiWrapper.getConfiguration(constants.notebookConfigKey);
 			if (notebookConfig) {
 				let configPythonPath = notebookConfig[constants.pythonPathConfigKey];
+				// tslint:disable-next-line:no-sync
 				if (configPythonPath && fs.existsSync(configPythonPath)) {
 					path = configPythonPath;
 				}
--- a/extensions/notebook/src/jupyter/serverInstance.ts
+++ b/extensions/notebook/src/jupyter/serverInstance.ts
@@ -62,8 +62,13 @@ export class ServerInstanceUtils {
 	public copy(src: string, dest: string): Promise<void> {
 		return fs.copy(src, dest);
 	}
-	public existsSync(dirPath: string): boolean {
-		return fs.existsSync(dirPath);
+	public async exists(path: string): Promise<boolean> {
+		try {
+			await fs.access(path);
+			return true;
+		} catch (e) {
+			return false;
+		}
 	}
 	public generateUuid(): string {
 		return UUID.generateUuid();
@@ -204,7 +209,7 @@ export class PerNotebookServerInstance implements IServerInstance {
 	private async copyKernelsToSystemJupyterDirs(): Promise<void> {
 		let kernelsExtensionSource = path.join(this.options.install.extensionPath, 'kernels');
 		this._systemJupyterDir = path.join(this.getSystemJupyterHomeDir(), 'kernels');
-		if (!this.utils.existsSync(this._systemJupyterDir)) {
+		if (!(await this.utils.exists(this._systemJupyterDir))) {
 			await this.utils.mkDir(this._systemJupyterDir, this.options.install.outputChannel);
 		}
 		await this.utils.copy(kernelsExtensionSource, this._systemJupyterDir);
--- a/extensions/notebook/src/test/book/book.test.ts
+++ b/extensions/notebook/src/test/book/book.test.ts
@@ -283,9 +283,9 @@ describe.skip('BookTreeViewProviderTests', function() {
 			await Promise.race([tocRead, errorCase.then(() => { throw new Error('Table of Contents were not ready in time'); })]);
 		});

-		it('should show error if notebook or markdown file is missing', function(): void {
+		it('should show error if notebook or markdown file is missing', async function(): Promise<void> {
 			let books = bookTreeViewProvider.getBooks();
-			let children = bookTreeViewProvider.getSections({ sections: [] }, books[0].sections, rootFolderPath);
+			let children = await bookTreeViewProvider.getSections({ sections: [] }, (await books)[0].sections, rootFolderPath);
 			should(bookTreeViewProvider.errorMessage).equal('Missing file : Notebook1');
 			// Rest of book should be detected correctly even with a missing file
 			equalBookItems(children[0], expectedNotebook2);
--- a/extensions/notebook/src/test/model/serverInstance.test.ts
+++ b/extensions/notebook/src/test/model/serverInstance.test.ts
@@ -57,7 +57,7 @@ describe('Jupyter server instance', function (): void {
 		// Given a server instance
 		mockUtils.setup(u => u.mkDir(TypeMoq.It.isAnyString(), TypeMoq.It.isAny())).returns(() => Promise.resolve());
 		mockUtils.setup(u => u.copy(TypeMoq.It.isAnyString(), TypeMoq.It.isAnyString())).returns(() => Promise.resolve());
-		mockUtils.setup(u => u.existsSync(TypeMoq.It.isAnyString())).returns(() => false);
+		mockUtils.setup(u => u.exists(TypeMoq.It.isAnyString())).returns(() => Promise.resolve(false));

 		// When I run configure
 		await serverInstance.configure();
@@ -65,7 +65,7 @@ describe('Jupyter server instance', function (): void {
 		// Then I expect a folder to have been created with config and data subdirs
 		mockUtils.verify(u => u.mkDir(TypeMoq.It.isAnyString(), TypeMoq.It.isAny()), TypeMoq.Times.exactly(5));
 		mockUtils.verify(u => u.copy(TypeMoq.It.isAnyString(), TypeMoq.It.isAnyString()), TypeMoq.Times.exactly(3));
-		mockUtils.verify(u => u.existsSync(TypeMoq.It.isAnyString()), TypeMoq.Times.exactly(1));
+		mockUtils.verify(u => u.exists(TypeMoq.It.isAnyString()), TypeMoq.Times.exactly(1));
 	});

 	it('Should have URI info after start', async function (): Promise<void> {
--- a/extensions/resource-deployment/src/services/platformService.ts
+++ b/extensions/resource-deployment/src/services/platformService.ts
@@ -26,10 +26,12 @@ export class PlatformService implements IPlatformService {
 	}

 	copyFile(source: string, target: string): void {
+		// tslint:disable-next-line:no-sync
 		fs.copyFileSync(source, target);
 	}

 	fileExists(file: string): boolean {
+		// tslint:disable-next-line:no-sync
 		return fs.existsSync(file);
 	}

@@ -44,4 +46,4 @@ export class PlatformService implements IPlatformService {
 	isNotebookNameUsed(title: string): boolean {
 		return (azdata.nb.notebookDocuments.findIndex(doc => doc.isUntitled && doc.fileName === title) > -1);
 	}
-}
+}
--- a/extensions/resource-deployment/src/services/resourceTypeService.ts
+++ b/extensions/resource-deployment/src/services/resourceTypeService.ts
@@ -6,7 +6,7 @@

 import * as azdata from 'azdata';
 import * as cp from 'child_process';
-import * as fs from 'fs';
+import { createWriteStream, promises as fs } from 'fs';
 import * as https from 'https';
 import * as os from 'os';
 import * as path from 'path';
@@ -226,7 +226,7 @@ export class ResourceTypeService implements IResourceTypeService {
 	private download(url: string): Promise<string> {
 		const self = this;
 		const promise = new Promise<string>((resolve, reject) => {
-			https.get(url, function (response) {
+			https.get(url, async function (response) {
 				console.log('Download installer from: ' + url);
 				if (response.statusCode === 301 || response.statusCode === 302) {
 					// Redirect and download from new location
@@ -247,19 +247,19 @@ export class ResourceTypeService implements IResourceTypeService {
 				let fileName = originalFileName;
 				const downloadFolder = os.homedir();
 				let cnt = 1;
-				while (fs.existsSync(path.join(downloadFolder, fileName + extension))) {
+				while (await exists(path.join(downloadFolder, fileName + extension))) {
 					fileName = `${originalFileName}-${cnt}`;
 					cnt++;
 				}
 				fileName = path.join(downloadFolder, fileName + extension);
-				const file = fs.createWriteStream(fileName);
+				const file = createWriteStream(fileName);
 				response.pipe(file);
 				file.on('finish', () => {
 					file.close();
 					resolve(fileName);
 				});
-				file.on('error', (err) => {
-					fs.unlink(fileName, () => { });
+				file.on('error', async (err) => {
+					await fs.unlink(fileName);
 					reject(err.message);
 				});
 			});
@@ -268,3 +268,12 @@ export class ResourceTypeService implements IResourceTypeService {
 	}

 }
+
+async function exists(path: string): Promise<boolean> {
+	try {
+		await fs.access(path);
+		return true;
+	} catch (e) {
+		return false;
+	}
+}
--- a/extensions/schema-compare/package.json
+++ b/extensions/schema-compare/package.json
@@ -64,7 +64,7 @@
 	},
 	"devDependencies": {
 		"@types/mocha": "^5.2.5",
-    "@types/node": "^10.14.8",
+		"@types/node": "^10.14.8",
 		"mocha": "^5.2.0",
 		"should": "^13.2.1",
 		"typemoq": "^2.1.0",
--- a/extensions/schema-compare/src/dialogs/schemaCompareDialog.ts
+++ b/extensions/schema-compare/src/dialogs/schemaCompareDialog.ts
@@ -9,8 +9,7 @@ import * as azdata from 'azdata';
 import * as vscode from 'vscode';
 import * as os from 'os';
 import { SchemaCompareMainWindow } from '../schemaCompareMainWindow';
-import { isNullOrUndefined } from 'util';
-import { existsSync } from 'fs';
+import { promises as fs } from 'fs';
 import { Telemetry } from '../telemetry';
 import { getEndpointName } from '../utils';
 import * as mssql from '../../../mssql';
@@ -35,6 +34,15 @@ const YesButtonText: string = localize('schemaCompareDialog.Yes', 'Yes');
 const NoButtonText: string = localize('schemaCompareDialog.No', 'No');
 const titleFontSize: number = 13;

+async function exists(path: string): Promise<boolean> {
+	try {
+		await fs.access(path);
+		return true;
+	} catch (e) {
+		return false;
+	}
+}
+
 export class SchemaCompareDialog {
 	public dialog: azdata.window.Dialog;
 	public dialogName: string;
@@ -194,8 +202,8 @@ export class SchemaCompareDialog {
 				ariaLabel: localize('schemaCompareDialog.sourceTextBox', "Source file")
 			}).component();

-			this.sourceTextBox.onTextChanged((e) => {
-				this.dialog.okButton.enabled = this.shouldEnableOkayButton();
+			this.sourceTextBox.onTextChanged(async (e) => {
+				this.dialog.okButton.enabled = await this.shouldEnableOkayButton();
 			});

 			this.targetTextBox = view.modelBuilder.inputBox().withProperties({
@@ -204,8 +212,8 @@ export class SchemaCompareDialog {
 				ariaLabel: localize('schemaCompareDialog.targetTextBox', "Target file")
 			}).component();

-			this.targetTextBox.onTextChanged(() => {
-				this.dialog.okButton.enabled = this.shouldEnableOkayButton();
+			this.targetTextBox.onTextChanged(async () => {
+				this.dialog.okButton.enabled = await this.shouldEnableOkayButton();
 			});

 			this.sourceServerComponent = await this.createSourceServerDropdown(view);
@@ -307,7 +315,7 @@ export class SchemaCompareDialog {
 		currentButton.onDidClick(async (click) => {
 			// file browser should open where the current dacpac is or the appropriate default folder
 			let rootPath = vscode.workspace.workspaceFolders ? vscode.workspace.workspaceFolders[0].name : os.homedir();
-			let defaultUri = endpoint && endpoint.packageFilePath && existsSync(endpoint.packageFilePath) ? endpoint.packageFilePath : rootPath;
+			let defaultUri = endpoint && endpoint.packageFilePath && await exists(endpoint.packageFilePath) ? endpoint.packageFilePath : rootPath;

 			let fileUris = await vscode.window.showOpenDialog(
 				{
@@ -351,17 +359,17 @@ export class SchemaCompareDialog {
 			}).component();

 		// show dacpac file browser
-		dacpacRadioButton.onDidClick(() => {
+		dacpacRadioButton.onDidClick(async () => {
 			this.sourceIsDacpac = true;
 			this.formBuilder.removeFormItem(this.sourceNoActiveConnectionsText);
 			this.formBuilder.removeFormItem(this.sourceServerComponent);
 			this.formBuilder.removeFormItem(this.sourceDatabaseComponent);
 			this.formBuilder.insertFormItem(this.sourceDacpacComponent, 2, { horizontal: true, titleFontSize: titleFontSize });
-			this.dialog.okButton.enabled = this.shouldEnableOkayButton();
+			this.dialog.okButton.enabled = await this.shouldEnableOkayButton();
 		});

 		// show server and db dropdowns or 'No active connections' text
-		databaseRadioButton.onDidClick(() => {
+		databaseRadioButton.onDidClick(async () => {
 			this.sourceIsDacpac = false;
 			if ((this.sourceServerDropdown.value as ConnectionDropdownValue)) {
 				this.formBuilder.insertFormItem(this.sourceServerComponent, 2, { horizontal: true, titleFontSize: titleFontSize });
@@ -370,7 +378,7 @@ export class SchemaCompareDialog {
 				this.formBuilder.insertFormItem(this.sourceNoActiveConnectionsText, 2, { horizontal: true, titleFontSize: titleFontSize });
 			}
 			this.formBuilder.removeFormItem(this.sourceDacpacComponent);
-			this.dialog.okButton.enabled = this.shouldEnableOkayButton();
+			this.dialog.okButton.enabled = await this.shouldEnableOkayButton();
 		});

 		// if source is currently a db, show it in the server and db dropdowns
@@ -408,17 +416,17 @@ export class SchemaCompareDialog {
 			}).component();

 		// show dacpac file browser
-		dacpacRadioButton.onDidClick(() => {
+		dacpacRadioButton.onDidClick(async () => {
 			this.targetIsDacpac = true;
 			this.formBuilder.removeFormItem(this.targetNoActiveConnectionsText);
 			this.formBuilder.removeFormItem(this.targetServerComponent);
 			this.formBuilder.removeFormItem(this.targetDatabaseComponent);
 			this.formBuilder.addFormItem(this.targetDacpacComponent, { horizontal: true, titleFontSize: titleFontSize });
-			this.dialog.okButton.enabled = this.shouldEnableOkayButton();
+			this.dialog.okButton.enabled = await this.shouldEnableOkayButton();
 		});

 		// show server and db dropdowns or 'No active connections' text
-		databaseRadioButton.onDidClick(() => {
+		databaseRadioButton.onDidClick(async () => {
 			this.targetIsDacpac = false;
 			this.formBuilder.removeFormItem(this.targetDacpacComponent);
 			if ((this.targetServerDropdown.value as ConnectionDropdownValue)) {
@@ -427,7 +435,7 @@ export class SchemaCompareDialog {
 			} else {
 				this.formBuilder.addFormItem(this.targetNoActiveConnectionsText, { horizontal: true, titleFontSize: titleFontSize });
 			}
-			this.dialog.okButton.enabled = this.shouldEnableOkayButton();
+			this.dialog.okButton.enabled = await this.shouldEnableOkayButton();
 		});

 		// if target is currently a db, show it in the server and db dropdowns
@@ -450,18 +458,18 @@ export class SchemaCompareDialog {
 		};
 	}

-	private shouldEnableOkayButton(): boolean {
+	private async shouldEnableOkayButton(): Promise<boolean> {

-		let sourcefilled = (this.sourceIsDacpac && this.existsDacpac(this.sourceTextBox.value))
+		let sourcefilled = (this.sourceIsDacpac && await this.existsDacpac(this.sourceTextBox.value))
 			|| (!this.sourceIsDacpac && !isNullOrUndefined(this.sourceDatabaseDropdown.value) && this.sourceDatabaseDropdown.values.findIndex(x => this.matchesValue(x, this.sourceDbEditable)) !== -1);
-		let targetfilled = (this.targetIsDacpac && this.existsDacpac(this.targetTextBox.value))
+		let targetfilled = (this.targetIsDacpac && await this.existsDacpac(this.targetTextBox.value))
 			|| (!this.targetIsDacpac && !isNullOrUndefined(this.targetDatabaseDropdown.value) && this.targetDatabaseDropdown.values.findIndex(x => this.matchesValue(x, this.targetDbEditable)) !== -1);

 		return sourcefilled && targetfilled;
 	}

-	private existsDacpac(filename: string): boolean {
-		return !isNullOrUndefined(filename) && existsSync(filename) && (filename.toLocaleLowerCase().endsWith('.dacpac'));
+	private async existsDacpac(filename: string): Promise<boolean> {
+		return !isNullOrUndefined(filename) && await exists(filename) && (filename.toLocaleLowerCase().endsWith('.dacpac'));
 	}

 	protected async createSourceServerDropdown(view: azdata.ModelView): Promise<azdata.FormComponent> {
@@ -596,9 +604,9 @@ export class SchemaCompareDialog {
 				ariaLabel: localize('schemaCompareDialog.sourceDatabaseDropdown', "Source Database")
 			}
 		).component();
-		this.sourceDatabaseDropdown.onValueChanged((value) => {
+		this.sourceDatabaseDropdown.onValueChanged(async (value) => {
 			this.sourceDbEditable = value;
-			this.dialog.okButton.enabled = this.shouldEnableOkayButton();
+			this.dialog.okButton.enabled = await this.shouldEnableOkayButton();
 		});

 		return {
@@ -615,9 +623,9 @@ export class SchemaCompareDialog {
 				ariaLabel: localize('schemaCompareDialog.targetDatabaseDropdown', "Target Database")
 			}
 		).component();
-		this.targetDatabaseDropdown.onValueChanged((value) => {
+		this.targetDatabaseDropdown.onValueChanged(async (value) => {
 			this.targetDbEditable = value;
-			this.dialog.okButton.enabled = this.shouldEnableOkayButton();
+			this.dialog.okButton.enabled = await this.shouldEnableOkayButton();
 		});

 		return {
@@ -684,3 +692,7 @@ export class SchemaCompareDialog {
 interface ConnectionDropdownValue extends azdata.CategoryValue {
 	connection: azdata.connection.ConnectionProfile;
 }
+
+function isNullOrUndefined(val: any): boolean {
+	return val === null || val === undefined;
+}
--- a/tslint.json
+++ b/tslint.json
@@ -229,6 +229,21 @@
 		"translation-remind": true,
 		"no-standalone-editor": true,
 		"no-nls-in-standalone-editor": true,
+		"no-sync": [
+			true,
+			{
+				"exclude": [
+					"**/vs/**", // assume they are doing the right thing
+					"**/extensions/git/**", // assume they are doing the right thing,
+					"**/extensions/extension-editing/**", // assume they are doing the right thing,
+					"**/json-language-features/**", // assume they are doing the right thing,
+					"**/vscode-test-resolver/**", // testing doesn't matter
+					"**/integration-tests/**", // testing doesn't matter
+					"**/*.test.*", // testing doesn't matter
+					"**/test/**" // testing doesn't matter
+				]
+			}
+		],
 		"no-useless-strict": true
 	},
 	"defaultSeverity": "warning"